Ja Morant Does Grenade Celebration After Gun Gesture Controversy

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Ja Morant went to his weapon wheel for his latest celebration ... electing for a "grenade" instead of his go-to "gun" gesture in Tuesday night's game.

The Memphis Grizzlies star debuted the move against the Charlotte Hornets at the Spectrum Center ... days after he was handed a $75,000 fine for pretending to unload a firearm on multiple occasions in competition, which the NBA publicly warned him to stop doing.

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Morant apparently can't help but channel his inner "Call of Duty" as he goes to war on the court ... 'cause he mimicked the explosive-tossing stunt throughout the night -- acting like…